What command did Mrs. Which give Meg, Charles, and Calvin on Camazotz?

All
three of the ladies give advice and guidance to the children when they arrive at Camazotz. Mrs.
Who gives hints to Calvin and Charles Wallace and her glasses to Meg. Mrs. Whatsit gives each
child one of their own qualities: to Calvin communication skills, to Meg her "faults"
(which will come in handy later, especially her stubbornness), and to Charles Wallace the
resilience of childhood. Mrs. Which's advice, unlike Mrs. Who's and Mrs. Whatsit's, takes the
form of a very clear command. As you know, Mrs. Which's voice is unclear and vibrates quite a
bit, but this is what she says:

To all three of you I give
my command. Go down into the town. Go together. Do not let them separate you. Be
strong.

This is an important instruction as the children
go forth. Everything about Camazotz is designed to unnerve them, and on several occasions, other
forces attemptand almost succeedin separating them. It is Meg's stubbornness that eventually
prevails. She refuses to allow them to be separated, even when things seem impossible. That
stubborn refusal to break Mrs. Which's command is what eventually leads them to success.
However, all the children will need to use every gift, hint, and piece of advice they have
received before the story is done.